72537757 has 4 divisors (see below), whose sum is σ = 72805696. Its totient is φ = 72269820.

The previous prime is 72537749. The next prime is 72537823. The reversal of 72537757 is 75773527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75773527 = 2797 ⋅27091.

It is a cyclic number.

It is not a de Polignac number, because 72537757 - 2³ = 72537749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72537557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133563 + ... + 134104.

It is an arithmetic number, because the mean of its divisors is an integer number (18201424).

Almost surely, 2^72537757 is an apocalyptic number.

It is an amenable number.

72537757 is a deficient number, since it is larger than the sum of its proper divisors (267939).

72537757 is a wasteful number, since it uses less digits than its factorization.

72537757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267938.

The product of its digits is 360150, while the sum is 43.

The square root of 72537757 is about 8516.9100617536. The cubic root of 72537757 is about 417.0499185928.

The spelling of 72537757 in words is "seventy-two million, five hundred thirty-seven thousand, seven hundred fifty-seven".